emelie is working on a science project. her task is to answer the question does rogooti a hair cream sold on tv affect the speed of hair growth in length her family is willing to volunteer for the experiment
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Answer:
This question is incomplete and unclear; the complete question including the missing part is:
Emelie is working on a science project. Her task is to answer the question:
"Does Rogooti (a hair cream sold on TV) affect the speed of hair growth
(in length)". Her family is willing to volunteer for the experiment. Identify the control group (CG) and the independent and dependent variables.
ANSWER:
Independent variable: Rogooti hair cream
Dependent variable: Speed of hair growth/length
Control group: Family members that do not use the Rogooti hair cream
Explanation:
In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to bring about a measurable response. In this case, the ROGOOTI HAIR CREAM is the independent variable.
Dependent variable refers to the variable that is measured or the variable that responds to the change made to the independent variable. In this case, the dependent variable is SPEED AT WHICH HAIR GROWS (IN LENGTH).
Control group in an experiment is the group that does not receive the experimental treatment. In this case, the experimental treatment is the Rogooti hair cream, hence, the control group will be the VOLUNTEER FAMILY MEMBERS THAT DOES NOT RECEIVE THE ROGOOTI HAIR CREAM ON THEIR HAIR.
Related Questions
What could using cobalt glass be helpful to identify?
Answers
Answer:
Using cobalt glass could be helpful to identify elements that weakly emit blue and/or violet.
Explanation:
A 0.65 l(v1) balloon is filled with helium to a pressure of 101.3 kpa (p1) if the pressure of the gas increases to 2 atm (p2),what is the new volume of the balloon (v2)
Answers
Dalton's law of partial pressures states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases
How do I calculate partial pressure?Partial pressures can be calculated in one of two ways: 1) To determine the individual pressure of each gas in a mixture, use PV = nRT. 2) Determine the proportion of pressure from the total pressure that may be assigned to each individual gas by using the mole fraction of each gas.
Pressure overall is 98.8 kPa. Each gas's partial pressure relates to how many moles of that gas there are in the combination. Therefore, the partial pressure of each gas is equal to (0.500/0.750) x 98.8 = 65.9 kPa for H2 (increased)
Because pressure and force are connected, you can determine one using the physics formula pressure = force/area if you know the other.
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what results when two or more atoms share electrons equally?
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A 322 g sample of lead (specific heat = 0.138 J/gºC) is placed into 264 g of water at 25°C. If
the system's final temperature is 46°C, what was the initial temperature of the lead?
Answers
Answer:
-6.31°C
Explanation:
To solve this problem, we can use the principle of heat transfer:The heat gained by the lead (q_lead) equals the heat lost by the water (q_water).The formula to calculate heat transfer is:
q = m * c * ΔTWhere:
q = heat transfer
m = mass
c = specific heat
ΔT = change in temperatureFor the lead:
q_lead = m_lead * c_lead * ΔT_leadFor the water:
q_water = m_water * c_water * ΔT_waterGiven values:
m_lead = 322 g
c_lead = 0.138 J/gºC
ΔT_lead = T_final - T_initial_lead (unknown)
m_water = 264 g
c_water = 4.18 J/gºC (specific heat of water)
ΔT_water = T_final - T_initial_water = 46°C - 25°C = 21°CSince the heat gained by the lead is equal to the heat lost by the water, we can set up the equation:
m_lead * c_lead * ΔT_lead = m_water * c_water * ΔT_waterSubstituting the given values:
322 g * 0.138 J/gºC * ΔT_lead = 264 g * 4.18 J/gºC * 21°CSimplifying the equation:
44.436 J/ºC * ΔT_lead = 2325.12 J/ºCDividing both sides of the equation by 44.436 J/ºC:
ΔT_lead = 2325.12 J/ºC / 44.436 J/ºC ≈ 52.31°CFinally, we can find the initial temperature of the lead:
T_initial_lead = T_final - ΔT_lead
T_initial_lead = 46°C - 52.31°C ≈ -6.31°CTherefore, the initial temperature of the lead was approximately -6.31°C.
Which real-world scenarios below represent physical changes? Check all that apply.
Answers
Answer:
wheres the options?
Explanation:
Arrange these elements into a table showing metals and non-metals: phosphorus, P, barium, Ba, vanadium, V. mercury, Hg, krypton, Kr, potassium, K, and uranium, U.
Answers
...,...................................
A chemist combines 300 mL of a 0.3 M Na2SO4 solution with 200 mL of 0.4 M BaCl2 solution. How many grams of precipitate form
Answers
The mass of the precipitate, BaSO₄ obtained from the given reaction is 18.64 grams
How to determine the mole Na₂SO₄Volume of Na₂SO₄ = 300 mL = 300 / 1000 = 0.3 LMolarity of Na₂SO₄ = 0.3 MMole of Na₂SO₄ =?Mole = Molarity x Volume
Mole of Na₂SO₄ = 0.3 × 0.3
Mole of Na₂SO₄ = 0.09 mole
How to determine the mole of BaCl₂Volume of BaCl₂ = 200 mL = 200 / 1000 = 0.2 LMolarity of BaCl₂ = 0.4 MMole of BaCl₂ =?Mole = Molarity x Volume
Mole of BaCl₂ = 0.4 × 0.2
Mole of BaCl₂ = 0.08 mole
How to determine the limiting reactantBalanced equation
Na₂SO₄(aq) + BaCl₂(aq) —> BaSO₄(s) + 2NaCl(aq)
From the balanced equation above,
1 mole of BaCl₂ reacted with 1 mole of Na₂SO₄.
Therefore,
0.08 mole of BaCl₂ will also react with 0.08 mole of Na₂SO₄.
From the above illustration, we can see that only 0.08 mole of Na₂SO₄ out of 0.09 mole given is neede to react completely with 0.08 mole of BaCl₂.
Therefore, BaCl₂ is the limiting reactant
How to determine the mass of the precipitate (BaSO₄) formedBalanced equation
Na₂SO₄(aq) + BaCl₂(aq) —> BaSO₄(s) + 2NaCl(aq)
From the balanced equation above,
1 mole of BaCl₂ reacted to produce 1 mole of BaSO₄.
Therefore,
0.08 mole of BaCl₂ will also react to produce 0.08 mole of BaSO₄.
The mass of BaSO₄ can be obtained as follow
Mole of BaSO₄ = 0.08 mole Molar mass of BaSO₄ = 137 + 32 + (16×4) = 233 g/mol Mass of BaSO₄ =?Mass = mole × molar mass
Mass of BaSO₄ = 0.08 × 233
Mass of BaSO₄ = 18.64 g
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How much heat energy is required to heat a 100 g sample of liquid water from 30 °C to water vapor at 110 °C?The specific heat of liquid water is 4.184 J/(g K) and water vapor is 2.008 J/(g K). The heat of vaporization for water is 2259 J/g and the heat of fusion is 334.72 J/g
Answers
The total heat energy required is expressed according to the formula:
\(\begin{gathered} Q_T=Q_{\text{vap,w}}+Q_w \\ \end{gathered}\)where:
Qvap is the heat energy absorbed by the vapor
Qw is the heat energy absorbed by the water
Get the heat energy absorbed by the vapor at 100 degrees
\(\begin{gathered} Q_{\text{vap,w}}=n_w\times\triangle H_{vap,w} \\ Q_{\text{vap,w}}=\frac{mass}{molar\text{ mass}}\times\triangle H_{vap,w} \\ \end{gathered}\)Given the following parameters;
Mass of water = 100g
Molar mass of water (H2O) = 18.015g/mol
Hvap,w = 2259 J/g = 40.8 kJ/mol
Substitute the given parameters into the formula to have:
\(\begin{gathered} Q_{\text{vap,w}}=\frac{100\cancel{g}}{18.015\cancel{g}\cancel{\text{mol}^{-1}}^{}}\times\frac{40.8kJ}{\cancel{\text{mol}}} \\ Q_{\text{vap,w}}=226.48kJ \end{gathered}\)Get the heat absorbed by the water from 30 to 100 degrees and from 100 to 110 degrees using the formula below. Note that the water vapor is being heated without any phase changes, so we will be utilizing the specific heat capacity of water vapor.
\(\begin{gathered} Q_w=m_wc_w(\triangle\theta)_w+m_wc_w\triangle\theta \\ Q_w=(100\times4.184\times(100-30))+(100g\times2.008\frac{J}{g^oC}\times(110-100)^oC) \\ Q_w=(100\times4.184\times70)+(100\times2.008\times10) \\ Q_w=29,288+2008 \\ Q_w=31296\text{Joules} \\ Q_w=31.296kJ \\ \end{gathered}\)Get the total heat energy required;
\(\begin{gathered} Q_T=226.48kJ+31.296kJ \\ Q_T=257.776kJ \end{gathered}\)The standard enthalpy of formation of a free element in its standard
state is 0.0 kJ.
True or false.
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in my opinion
What hydrogen/signal in the structure/nmr is strongly indicative that you successfully reduced the imine to the amine?
Answers
The appearance of the amine proton signal and the absence of the imine proton signal strongly suggest the successful reduction of the imine to the amine in the molecule.
In nuclear magnetic resonance (NMR) spectroscopy, the hydrogen signals in a molecule can provide valuable information about its structure and chemical environment. When it comes to the reduction of an imine to an amine, a specific hydrogen signal is strongly indicative of the successful reduction.
The hydrogen signal that is indicative of the reduction is the disappearance of the imine proton signal (N-H) and the appearance of a new amine proton signal (N-H) in the NMR spectrum. In the imine compound, the imine proton typically appears as a signal around 7-8 ppm, depending on the specific structure. However, after the reduction to the amine, the imine proton disappears, and a new amine proton signal appears in the range of 1-4 ppm, depending on the specific structure of the amine.
The appearance of the amine proton signal and the absence of the imine proton signal strongly suggest the successful reduction of the imine to the amine in the molecule. This change in the NMR spectrum provides evidence of the structural transformation from an imine to an amine compound.
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Whats the best red waterproof lipstick? Need some help :)
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\(\(\blue{\rule{40pt}{900000000pt}}\)\)
What is the molecular formula for this molecule? a
Answers
Answer:
In a molecular formula, it states the total number of atoms of each element in a molecule.
Explanation:
21. epsom salts, a strong laxative used in veterinary medicine, is a hydrate, which means that a certain number of water molecules are included in the solid structure. the formula for epsom salts can be written as mgso4*xh2o, where x indicates the number of moles of h2o per mole of mgso4. when 5.061 g of this hydrate is heated to 250oc, all the water of hydration is lost, leaving 2.472 g of mgso4. what is the value of x?
Answers
The value of x = 7 and the compound is MgSO₄•7H₂O , Epsom salts, a strong laxative used in veterinary medicine, is a hydrate,
To begin, we can convert the lost H₂O mass into the moles of H₂O that were present.
5.061 g - 2.472 g = 2.589 g of H₂O
moles H₂O = 2.589 g H₂O x 1 mol H₂O/18 g
= 0.1438 moles H₂O
moles MgSO₄ = 2.472 g MgSO₄ x 1 mol MgSO₄ /120.4 g
= 0.0205 moles MgSO₄
Now we find the ratio of H₂O to MgSO₄ : 0.1438 mol/0.0205 moles
= 7.01
Let the value of x = 7 and the formula for the compound is
MgSO₄•7H₂O
For what reason is Epsom salt a hydrate?
Epsom salt (otherwise known as magnesium sulfate) is a blend of MgSO₄ and H₂O. Numerous ionic mixtures integrate a decent number of water particles into their gem structures. These are called hydrates. Epsom salt, or magnesium sulfate heptahydrate, is a hydrous magnesium sulfate mineral with recipe MgSO₄•7H₂O
How does Epsom salts work?Epsom salt decomposes into magnesium and sulfate when dissolved in water. The hypothesis is that when you absorb an Epsom salt shower, these minerals help assimilated into your body through the skin. This may assist in muscle relaxation, lessen arthritis-related swelling and pain, and alleviate fibromyalgia-related and other types of pain.
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Charges of +2 µC and +3 µC are 4 mm from each other. Raina's group draws four diagrams trying to represent the
electrical force between the charges.
+2 μC +3 μC +2 μC +3 μC +2 μC +3 μC +2 μC +3 μC
W
Z
X
Y
Which diagram is correct?
O W
OX
ΟΥ
OZ
Mark this and return
Next
Submit
Answers
The correct diagram is W.
A diagram is often a -dimensional display that communicates the use of visual relationships. it is a simplified and dependent visual representation of ideas, ideas, buildings, family members, statistical records, anatomy, etc. it can be used for all elements of human activities to give an explanation for or illustrate a topic. example Diagrams are graphics that show a photo, or photographs, accompanied with the aid of either note, labels, or a legend, which will explain principles or techniques. Describe gadgets or locations.
Display how matters paintings, circulate or change. assist provide extra perception into the issue displayed. A diagram is a drawing that suggests the distinctive parts of something and the way they work collectively. three-Line diagram is part of the detailed design document. Used for manipulating designing circuit diagrams, managing circuits, segment sequencing, differential relay placing, and metering transformer connection. A records chart is a sort of diagram or graph, that organizes and represents a set of numerical or qualitative information.
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ANSWE
Some students believe that teachers are full of hot air. If I inhale 2. 2
liters of gas at a temperature of 18 °C and it heats to a temperature of
38 °C in my lungs, what is the new volume of the
Answers
the new volume of the gas when its temperature changes from 18°C to 38°C. In this case, the can be found using the combined gas law formula.
Convert the temperatures to Kelvin. Add 273 to each Celsius temperature Initial temperature (T1) = 18°C + 273 = 291K Final temperature (T2) = 38°C + 273 = 311K Apply the combined gas law formula, which is (V1/T1) = (V2/T2), where V1 and V2 are the initial and final volumes, and T1 and T2 are the initial and final temperatures.
The known values and solve for V2.(2.2 L / 291 K) = (V2 / 311 K)V2 = (2.2 L * 311 K) / 291 K = 2.35 L (rounded to two decimal places)The new volume of the gas when it heats to a temperature of 38°C in your lungs is approximately 2.35 liters.
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A customer is traveling to a branch office static ip.
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Answer:
A customer is travelling to a branch office, and the network administrator provides her with a static IP address for her laptop
Explanation:
I hope this helps!!!...
Brainliest please???
Which response contains all the statements TRUE of buffer solutions, and NO flase statements. I. A buffer soltuion could consit of equal concentrations of ammonia and ammonium bromide. II. A buffer solution could consist of equal concentrations of perchloric acid, HClO4, and sodium perchlorate. III. A buffer solution will change only slightly in pH upon addition of acid or base. IV. In a buffer solution containing benzoic acid, C6H5COOH, and sodium benzoate, NaC6H5COO, the species that reaccts wtih added [OH-] is the benzoate ion
Answers
The response that contains all the true statements about buffer solutions and no false statements is:
I. A buffer solution could consist of equal concentrations of ammonia and ammonium bromide.
III. A buffer solution will change only slightly in pH upon addition of acid or base.
IV. In a buffer solution containing benzoic acid, C6H5COOH, and sodium benzoate, NaC6H5COO, the species that reacts with added [OH-] is the benzoate ion.
Statement II is false because perchloric acid, HClO4, is a strong acid and sodium perchlorate is a strong base. A buffer solution requires a weak acid and its conjugate base or a weak base and its conjugate acid to resist changes in pH upon the addition of acid or base. Perchloric acid and sodium perchlorate do not fulfill this requirement. Therefore, the correct response is I, III, and IV.
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In a buffer solution containing benzoic acid, C6H5COOH, and sodium benzoate, NaC6H5COO, the species that reacts with added hydroxide ions is the benzoate ion. All the statements are TRUE, and there are NO false statements.
A buffer solution is a solution that is resistant to pH change upon the addition of an acidic or basic compound. This is due to the presence of both a weak acid and its conjugate base, or a weak base and its conjugate acid, in the solution. A buffer solution could consist of equal concentrations of ammonia and ammonium bromide. In a buffer solution, the pH remains relatively constant when small amounts of a strong acid or base are added to it. The benzoate ion is the species that reacts with added hydroxide ions in a buffer solution containing benzoic acid, C6H5COOH, and sodium benzoate, NaC6H5COO.In a buffer solution containing benzoic acid, C6H5COOH, and sodium benzoate, NaC6H5COO, the species that reacts with added hydroxide ions is the benzoate ion. All the statements are TRUE, and there are NO false statements.
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Calculate the molar mass of CH4 gas at STP when 5.46Lof the gas weighs 4g??
Answers
Answer:
About 16.42 grams
Explanation:
\(PV=nRT \\\\(1)(5.46L)=n(0.0821)(273) \\\\n\approx 0.2436 \\\\4g/0.2436\approx 16.42\)
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although there are almost no vitamins or minerals in soda, there is a small amount of phosphorus in cola-type sodas. phosphorus is a mineral that plays a role in bone health. the amount of phosphorus in cola-type sodas is very small, however, compared to daily phosphorus needs. on the spreadsheet report, find the phosphorus (phos) column. how does the amount of phosphorus in the plain milk compare to that of the soda? how to calculate nutrient comparisons multiple choice the soda contains approximately 11 times more phosphorus than the milk. the milk and the soda contain the same amount of phosphorus. the milk contains approximately 11 times more phosphorus than the soda. the milk does not contain phosphorus.
Answers
The amount of phosphorus in plain milk compared to that of soda can be determined by observing the phosphorus (phos) column of the spreadsheet report.
The nutrient comparisons can be calculated using multiple-choice tests. Here are the possible answers to the given question, and the correct one. Soda contains approximately 11 times more phosphorus than milk. The given statement is the answer to the question asked. It means that the amount of phosphorus in plain milk is very less compared to soda. Soda contains approximately 11 times more phosphorus than milk, but still, the amount of phosphorus in soda is much lower than the daily phosphorus needs of the human body.
The given statement is true because there is a small amount of phosphorus in cola-type sodas. Phosphorus is a mineral that plays a role in bone health. The amount of phosphorus in cola-type sodas is very small compared to daily phosphorus needs. Therefore, although there are almost no vitamins or minerals in soda, there is a small amount of phosphorus in cola-type sodas.
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How many sucrose molecules are in 3.0 moles of sucrose?
Answers
Answer: No of molecule of sucrose = 1.806 X 10^24
Explanation:
No. of molecules = No. of moles X NA
No. of molecule of sucrose = 3 moles X 6.02 X 10^23
No of molecule of sucrose =18.06 X 10^23
No of molecule of sucrose =1.806 X 10^24
Answer:
1.80 × 10²⁴ Molecules of Sucrose
what is the approximate partial pressure of oxygen at 1500 m?
Answers
The approximate partial pressure of oxygen at 1500 m is 0.18 atm.
Pressure of the airFrom barometric pressure table;
1500 m = 85 kPa
1 kPa = 0.0099 atm
85 kPa = ?
= 0.84 atm
Oxygen percentage in air = 21%
Partial pressure of oxygen in air
P = 0.21 x P(total)
P = 0.21 x 0.84 atm
P = 0.18 atm
Thus, the approximate partial pressure of oxygen at 1500 m is 0.18 atm.
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9. The next year there is a new head gardener who decides to run the same experiment but over 2 different years, differently from 8. Let's assume that these 2 years have remarkably similar weather so the plants will behave the same each time except for the effects of the fertiliser. The gardener compares the growth rate of each individual plant between the 2 gardening seasons. The average difference in monthly growth rate (inches) for the plants is 1.55 with a standard deviation of 0.093. They choose only 49 plants for this experiment. (a) Construct a 95% confidence interval for the difference between the average growth rate of the plants between the 2 gardening seasons. (b) Which of the two 95% intervals (the one from question 8a or from this question part a) is narrower? Why is it so? (c) Which of the two 95% intervals (the one from question 8a or from this question part a) is more convincing in making a point that the head gardener should start using the newer fertiliser, if there is a difference?
Answers
(a) The 95% confidence interval for the difference between the average growth rate of the plants between the 2 gardening seasons is 1.55 ± 0.187 inches.
(b) The 95% interval from question 8a is narrower than the interval in this question (part a).
(c) The 95% interval from this question (part a) is more convincing in making a point that the head gardener should start using the newer fertilizer, if there is a difference.
Explanation to the short answers written above is written below,
(a) To construct the 95% confidence interval, we use the formula:
Confidence interval = sample mean ± (critical value * standard error)
In this case, the sample mean difference in monthly growth rate is 1.55 inches, and the standard deviation is 0.093 inches. Since the sample size is 49, we can assume the sampling distribution is approximately normal.
Using the appropriate critical value (which depends on the desired confidence level), we can calculate the standard error and construct the interval.
(b) The 95% interval from question 8a is narrower because it was constructed using a larger sample size (100 plants) compared to the current question (49 plants). A larger sample size provides more precise estimates and reduces the standard error, resulting in a narrower confidence interval.
(c) The 95% interval from this question (part a) is more convincing in making a point that the head gardener should start using the newer fertilizer, if there is a difference.
This is because the interval in this question has a smaller margin of error, indicating a higher level of precision in estimating the true difference in growth rates.
A smaller margin of error suggests a more reliable and accurate estimate, providing stronger evidence to support the conclusion that the newer fertilizer has a significant impact on plant growth.
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How is an endothermic reaction identified?
A. It has a large heat capacity.
B. It gives off heat as a product.
C. It requires heat as a reactant.
O D. It results in a phase change.
Answers
Answer:
Endothermic is identified if the process requires heat as a reactant, since endothermic means "intake of heat", so it has to take in some type of heat.
Pearls are made of calcium carbonate and can be broken down ( or dissolved ) by Hcl according to the following balanced equation :
CaCo3 + 2 HCl -> CaCl2 + H2O + CO2
What volume of 0.400 M HCl would be needed to dissolve a CaCO3 pearl which weighs 0.400 grams?
Answers
\(\boxed{\sf Molarity=\dfrac{Moles}{Vol\:in\:L}}\)
Moles of CaCO_3:-
0.4/100=0.004mol1 mol Calcium carbonate need 2 mol HCl0.004 mol will need 0.004(2)=0.008mol HClCome to formula stated first
\(\\ \tt\Rrightarrow Volume=\dfrac{Moles}{Molarity}\)
\(\\ \tt\Rrightarrow volume=\dfrac{0.008}{0.4}\)
\(\\ \tt\Rrightarrow volume=0.02\ell=20m\ell\)
why is a temperature of -280 c impossible?
Answers
A temperature of -280°C is impossible because it is below absolute zero which is the lowest possible temperature that can be reached.
Absolute zero is defined as -273.15°C or 0 Kelvin.
Which part of the atom makes it unique?
Answers
Answer:
nucleus
Explanation:
How many centimeters are in 5.46 meters
Answers
Answer: 546 meters
Explanation: multiply the length value by 100
if 4.10 grams of chromium is heated with 9.30 grams of chlorine what mass of chromium(III) chloride is produced?
Answers
Answer:
4.1g of Cr will make (317/104) x 4.1 = 12.5g of CrCl3
How did the data from the class barometer compare to the air pressure shown in the weather report?
How did the data from the class barometer compare to the air pressure shown in the weather report?
Answers
The comparison between the class barometer data and the air pressure shown in the weather report serves as a means to evaluate the accuracy and effectiveness of the barometer's measurements.
The comparison between the data from the class barometer and the air pressure shown in the weather report revealed a correlation between the two measurements. The class barometer readings were likely taken at the same time as the weather report's air pressure measurement to ensure accurate comparison.
If the class barometer readings closely matched the air pressure indicated in the weather report, it would suggest that the barometer was functioning correctly and providing reliable measurements. This would indicate that the class barometer could be used as a reliable tool for monitoring air pressure changes.
However, if there were significant discrepancies between the class barometer readings and the air pressure reported in the weather report, it could indicate a calibration issue with the barometer or potential inaccuracies in its measurements. In such a case, it would be necessary to investigate the reasons behind the discrepancies and determine the reliability of the class barometer for future use. It helps to determine the barometer's reliability as a tool for monitoring air pressure changes in the local environment.
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44. Aspartame is one of the most common alternatives to sugar. It is a dipeptide of _______. a. alanine and glycine b. aspartic acid and alanine c. phenylalanine
d. aspartic acid and phenylalanine e. none of these
Answers
The correct answer is d. aspartic acid and phenylalanine.
What is aspartame?Aspartame is an artificial sweetener that is about 200 times sweeter than sugar. It is composed of two amino acids, aspartic acid and phenylalanine, linked together by a peptide bond.
When aspartame is ingested, it is broken down into its constituent amino acids and absorbed by the body. Because it is so sweet, only a small amount of aspartame is needed to achieve the desired level of sweetness, which is why it is often used as a sugar substitute in diet drinks, desserts, and other low-calorie foods.
Therefore, the correct answer is d. aspartic acid and phenylalanine.
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